The donation was done way back in 2013, that's like almost 10 years ago. Well, the video was uploaded in 2021 so that's actually 8 years later. But just the same, didn't she change computers or laptops since then?
Assuming that my broad assumption is right — the fact that she might've just saved her Blockchain.com login credentials on her browser, well, Chrome — the most used browser ever, syncs saved login credentials to your Google account by default. Everything should be backed up assuming she's using the same Google account.